Saline (10 mL) will be administered via the needle to dilate the space where the catheter is to be inserted. A flexible non-stimulating perineural catheter (FlexTip, Arrow International, Reading, PA, USA) will be inserted 3-5 cm past the needle tip; and the needle withdrawn over the catheter. A 30 mL bolus of lidocaine 2% with 1:400,000 of epinephrine will then be administered though the catheter. A "successful" catheter insertion will be defined as decreased sensation to cold within the distribution of the saphenous nerve.